What Is The Function Of Pupil
Pupil Eye Meaning
The pupil is the black hole located at the center of the iris of the eye which allows light to reach the retina.
The pupil is an opening in the iris of the eye, through which light enters before it reaches the lens and is focused on the retina. The muscles of the iris regulate the size of the opening; they quickly constrict the pupil when it is exposed to bright light, and dilate the pupil when in dim light.
Table of Contents
It’s time to get started!
It’s time to get started!
[Frequently Asked Questions](#Frequently Asked Questions)
Pupil is an open source eye tracking platform that enables researchers and developers to study and develop assistive technologies that serve human needs.
Eye Pupil Meaning
The pupil is the small black circle in the centre of the iris. It is a tiny hole present over the lens through which light enters the eye and focuses on the retina for image formation. The iris muscles regulate the size of the pupil and control the amount of light entering it.
The pupil, located in the central opening of the iris, is typically black in colour. The surrounding area of brown, blue or grey is called the iris, while the outer white area is the sclera.
The pupil typically appears round in shape and black in colour, and is generally equal in size. The black colour is a consequence of light passing through the pupil and being absorbed by the retina, instead of being reflected back.
Also Explore:
| What is the function of the iris? |
| What is the sclera of the eye? |
Pupil: Function
The pupil is black because all the light that goes into the eye is absorbed by the retina. It is similar to the aperture of a camera. There are two types of iris muscles that control the size of the pupil:
Circular Sphincter Pupillae - Constricts Pupil on Contraction
Radial Dilator Pupillae - Dilates Pupil upon Contraction
The pupillary light reflex is a process that controls the diameter of the pupil and adjusts the light intensity entering the eye. This is done by responding to the light striking the ganglion cells in the retina at the back of the eye. In dim light, the pupil will dilate, and in bright light, it will constrict. This helps to protect the lens and retina from damage due to high light intensity, and also allows people to see clearly in dim light.
The color of the pupil becomes pale yellow when the lens becomes opaque or cloudy in case of cataract.
What is the size of the Pupil?
From person to person, the size of the pupil differs. In some it is small and in some it is large; it also varies with age wherein young adults tend to have a bigger pupil.
Typically, the normal size of the pupil’s diameter in adults ranges between 2 and 4 millimetres in bright light, and in the dark it ranges from 4 to 8 millimetres.
Pupils usually constrict while being affected by light when focused on an object nearby; this is referred to as the accommodative pupillary response.
Dilated Pupil
The muscles of the iris govern the size of the opening. They instantly constrict upon exposure to bright light and dilate the pupil when in dim light. The parasympathetic nerve fibres arising from the third cranial nerve innervate the muscles which induce the constriction of the pupil. On the other hand, the sympathetic nerve fibres regulate the dilation. The pupillary aperture in addition, channels while focusing on objects nearby and dilates when viewing objects at a distance.
The pupil changes its size to allow more or less light to enter the eye. These movements are not voluntary, but rather involuntary, and are regulated by the autonomic nervous system. When there is low light, the pupil dilates, increasing in size and allowing more light to pass through. This is done by the dilator pupillae muscle, which is controlled by the sympathetic nervous system.
Frequently Asked Questions
Pupil is the black, circular opening in the center of the iris of the eye that allows light to enter the retina.
The shape of the pupil is usually circular in most eyes.
The pupil in humans is a small black circle in the centre of the iris. It is usually round, but the shape can differ between species; reptiles, foxes, and cats often have vertical slit pupils.
How does pupil size get determined?
The circular sphincter pupillae constricts the pupil upon contraction, while the radial dilator pupillae dilates the pupil upon contraction. These two muscles are responsible for controlling the size of the pupil.
![Mechanism of Vision]()
NEET NCERT Solutions (Biology)
- Animal Kingdom
- 16S Rrna
- Abscission
- Acromion Process Notes
- Alcoholic Fermentation
- Assisted Reproductive Technology
- Attempting Neet Biology In 45 Minutes
- Auxin
- Bioremediation Mcqs
- Bones Of Spine
- Carbon Fixation
- Chondrocytes
- Choroid
- Chromosomal Disorder In Humans
- Chromosome Number Of List Of Organisms
- Compound Leaf Notes
- Connective Tissue
- Constitutive Transcription
- Cyathium Inflorescence
- Cycas Notes
- Diadelphous Stamen Notes
- Different Stem Modifications With Examples
- Digestive System Of Balanoglossus
- Digestive System Of Frog
- Diplontic Life Cycle
- Dna Polymerases
- Double Helix Structure Of Dna
- Down Syndrome Chromosome Number
- Dryopteris
- Earthworm Digestive System
- Economic Importance Of Algae
- Emp Pathway
- Epithelial Tissue
- Equisetum
- Factors Affecting Water Potential
- Floral Formula
- Floral Formula Of Fabaceae
- Floral Formula Of Hibiscus
- Floral Formula Of Liliaceae
- Floral Formula Of Solanaceae
- Function Of Pons
- Functions Of Human Skeletal System
- Gamete Intrafallopian Transfer
- Gene Expression
- Green Algae
- Hatch And Slack Cycle
- Heterosporous Pteridophytes
- Heterozygous
- Histone
- Histone Octamer
- How Do Plants Reduce Water Loss
- Human Eye Lens
- Hypanthodium
- Iaa Hormone
- Important Notes For Neet Biology Strategies For Enhancement In Food Production
- Important Notes For Neet Living World
- Important Notes For Neet Locomotion And Movement
- Important Notes For Neet Molecular Basis Of Inheritance
- Important Notes For Neet Morphology Of Flowering Plants
- Important Notes For Neet Plant Growth And Development
- Important Notes For Neet Plant Kingdom
- Important Notes For Neet Plant Taxonomy
- Important Notes For Neet Principles Of Inheritance And Variation
- Important Notes For Neet Reproductive Health
- Krebs Cycle
- Lactational Amenorrhea
- Lag Phase
- Last Minute Guide For Neet Biology
- Leaf Venation Notes
- Leguminosae
- Lethal Genes
- Locomotory Disorders
- Log Phase
- Long Day Plants
- Maize Chromosome Number
- Marchantia
- Mcq On Animal Tissues
- Mcq On Biomass Energy
- Mcq On Cardiovascular System
- Mcq On Excretory System
- Mcq On Global Warming
- Mcq On Krebs Cycle
- Mcq On Mitochondria
- Mcq On Ozone Layer Depletion
- Mcq On Prokaryotes
- Mcq On Regualtion Of Gene Expression In Eukaryotes
- Mcqs On Amino Acids
- Mcqs On Biopesticides
- Mcqs On Blood
- Mcqs On Diseases Caused By Protozoa
- Mcqs On Epithelial Tissue
- Mcqs On Mendel Laws Of Inheritance
- Mcqs On Protein Synthesis
- Mechanism Of Vision
- Medulla Oblongata
- Midbrain Function Notes
- Mirna Notes
- Mrna Notes
- Multiple Alleles Notes
- Neet Biology Flashcards
- Neet Biology Mcq Cell Structure And Function
- Neet Biology Mcq On Dna Structure
- Neet Biology Mcq On Lipids
- Neet Biology Syllabus
- Neet Questions Animal Kingdom
- Neet Questions Biological Classification
- Neet Questions Biotechnology And Its Application
- Neet Questions Biotechnology Principles And Processes
- Neet Questions Body Fluids And Circulation
- Neet Questions Breathing And Exchange Of Gases
- Neet Questions Cell Cycle And Cell Division
- Neet Questions Cell The Unit Of Life
- Neet Questions Digestion And Absorption
- Neet Questions Evolution
- Neet Questions Human Health And Diseases
- Neet Questions Human Reproduction
- Neet Questions Locomotion And Movement
- Neet Questions Molecular Basis Of Inheritance
- Neet Questions Morphology Of Flowering Plants
- Neet Questions Neural Control And Coordination
- Neet Questions Organisms And Populations
- Neet Questions Principles Of Inheritance And Variation
- Neet Questions Reproduction In Organisms
- Neet Questions Respiration In Plants
- Neet Questions Sexual Reproduction In Flowering Plants
- Neet Questions The Living World
- Neet Questions Transport In Plants
- Neuron Physiology
- Non Vascular Plants
- Nondisjunction
- Nucleotide
- Number Of Chromosomes In Humans
- Palmately Compound Leaf Notes
- Pectoral Girdle
- Pelvic Girdle
- Pem Mcqs
- Pep Carboxylase
- Phyllotaxy Notes
- Pinnately Compound Leaf Notes
- Plant Hormones
- Plasma Membrane Mcqs
- Polygenic Inheritance
- Process Of Neural Communication
- Pteris
- Pyruvate
- Racemose Inflorescence
- Ray Florets Notes
- Respiratory Substrates
- Rice Chromosome Number
- Rna Splicing
- Rubisco
- Salvinia
- Selaginella
- Senescence And Abscission
- Sensory Receptors
- Short Notes For Neet Aneuploidy
- Short Notes For Neet Cam Plants
- Short Notes For Neet Disorders Of Bones
- Short Notes For Neet Disorders Of Joints
- Short Notes For Neet Disorders Of Muscular System
- Short Notes For Neet Glycolate Pathway
- Short Notes For Neet Hindbrain
- Short Notes For Neet Synapse
- Short Notes For Neet Trna Structure
- Significance Of Glycolysis
- Simple Diffusion
- Sirna Notes
- Somatic Embryogenesis
- Spirogyra
- Spliceosomes Notes
- Squamous Epithelial Cells
- Stress Hormones
- Structure Of Ear
- Synopsis On Tissues
- Taxonomic Keys
- Thalamus Function
- Types Of Cymose Inflorescence
- Types Of Muscular Dystrophy
- Vernalization
- Visceral Nervous System Notes
- Volvox
- What Are Floating Ribs
- What Are The Three Primary Layers Of Retina
- What Are Vascular Plants
- What Causes Down Syndrome
- What Is Acromion
- What Is Collagen
- What Is Epistasis
- What Is Stroma
- What Is Thalassemia And What Are Its Types
- What Is The Blind Spot In Eye
- What Is The Function Of Cochlea
- What Is The Function Of Cornea
- What Is The Function Of Eustachian Tube
- What Is The Function Of Iris
- What Is The Function Of Pupil
- What Is The Function Of Stroma Lamellae
- What Is The Function Of Thylakoid
- What Is The Sclera Of Eye
- What Is Turner Syndrome
- What Is Vegetative Propagation And When Is It Used
- When Does Dna Copying Occur
- Where Does The Oxygen Liberated During Photosynthesis Come From
- Where Is Optic Nerve Located
- Where Is Scapula Bone Located
- Where Is The Glenoid Cavity Located
- Which Organism Is Known As Drosophila Of Plant Kingdom
- Why Solve Mcqs For Neet Biology
